Easily get the list of any membership and packages clients. Follow the steps:
1. Go to Clients
2. Select Client Type as Membership and you will get a list of all membership client
Or You can select specific membership and get the list.
3. Click over Any Membership >> Select and Search
Also can export it
For Package client :
Select Client Type as Package and you will get a list of all package clients.
If you need to check for specific package do select package and search.

Also, here is the video tutorial for your reference